Hormones

Researchers have found that many women with IBS report worsened symptoms during their menstrual period, suggesting that the female sex
hormones, oestrogen and progesterone, can increase IBS symptoms. Research also suggests that the speed at which the bowel contracts to move
food along the digestive tract varies at different stages of the menstrual cycle as the relative levels of these two hormones alter.
The hormones produced in the digestive tract, including cholecystokinin, which stimulates gallbladder contractions after a meal, and motilin,
which helps regulate bowel motility, have been suspected of triggering IBS symptoms in some people.

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